#!/usr/bin/python3
sites = {'Google','Taobao','Runoob','Fackbook','Zhihu','Baidu'}

print(sites)

if 'Runoob' in sites:
      print('Runoob 在集合中')
else:
      print('Runoob 不在集合中')

a = set('abracadabra')
b = set('alacazam')

print(a)

print(a - b)

print(a | b)

print(a & b)

print(a ^ b)